package network;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.Scanner;

public class TcpEchoClient {
    public Socket socket = null;

    public TcpEchoClient(String serveIp,int port) throws IOException {
        //这个操作就相当于让客户端和服务器建立tcp 连接
        //这里的连接 连上了 , 服务器 accept 就会返回
        socket = new Socket(serveIp,port);
    }

    public void start() {
        Scanner scanner = new Scanner(System.in);
        try (InputStream inputStream = socket.getInputStream();
             OutputStream outputStream = socket.getOutputStream()) {
            PrintWriter printWriter = new PrintWriter(outputStream);
            Scanner scannerFromSocket = new Scanner(inputStream);
            while (true) {
                //1.从键盘上读取用户输入的内容
                System.out.print("-> ");
                String request = scanner.next();
                //2. 把读取的内容构造成请求 , 发送给服务器
                //   注意 , 这里的发送 , 是带有换行的
                printWriter.println(request);
                printWriter.flush();//刷新
                //3. 从服务器读取响应内容
                String response = scannerFromSocket.next();
                //4.把响应 结果显示到控制台上
                System.out.printf("req: %s; resp:%s\n",request,response);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) throws IOException {
        TcpEchoClient client = new TcpEchoClient("127.0.0.1",9090);
        client.start();
    }


}
